Bob makes dinner every saturday.改为否定句、一般疑问句、就划线部分提问

问题描述:

Bob makes dinner every saturday.改为否定句、一般疑问句、就划线部分提问

Bob makes dinner every saturday.
否定句
Bob doesn't make dinner every saturday.
一般疑问句
Does Bob make dinner every saturday?
就划线部分提问
划线部分是哪里?every saturday.When does Bob make dinner?